isval

isval is a helper module that validates any given value. It overcomes common JavaScript issues with type checking, like NaN and null values.

Example

var isval = require('isval');
var string = 'I am a string';

assert.ok(isval(string, 'string'));

Installation

Node

To install isval in a Node application use npm.

$ npm install isval

Browser

No tests available for the browser but you may try using it via webpack.

$ webpack index.js isval.js

Test

To run tests use npm.

$ npm install
$ npm test

Documentation

Basic Usage

The following types are available:

• 'string'
• 'number'
• 'boolean'
• 'function'
• 'object'
• 'array'
• 'regex'
• 'regexp'
• 'date'
• 'null'
• 'undefined'
• 'NaN'
• 'arguments'
• 'integer'
• 'generator', (function *(){})()
• 'generator*', function *() {}

Types can also be literal values:

• String
• Number
• Boolean
• Object
• null
• undefined
• NaN

Instance Of

Passing a constructor function will check if the value is an instanceof of that "Class".

var buffer = new ArrayBuffer();
isval(buffer, ArrayBuffer);

Truthy Values

Passing no type will check for truthy values.

isval(1);
isval('true');

API

isval(<value>, [type])

License

MIT

Copyright (c) 2014 Christopher Turner